/* =============================================
   mysterious.quest — Styles
   Light-academia investigator's codex
   Translucent frost palette with blur-focus
   ============================================= */

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Palette Variables */
:root {
    --cream-vellum: #f5f2eb;
    --frost-white: #e8eff4;
    --deep-walnut: #3d3229;
    --warm-umber: #4a4038;
    --aged-copper: #8b7d6b;
    --oxidized-patina: #a3c4bc;
    --ice-blue: #c7dde8;
    --frost-shadow: rgba(163, 196, 188, 0.2);
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--cream-vellum);
    color: var(--warm-umber);
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: clamp(1rem, 1.8vw, 1.15rem);
    line-height: 1.72;
    overflow-x: hidden;
}

/* ===== CIRCUIT SPINE ===== */
.circuit-spine {
    position: fixed;
    left: 20px;
    top: 0;
    width: 40px;
    height: 100vh;
    z-index: 100;
    pointer-events: none;
}

.spine-path {
    transition: stroke 0.8s ease;
}

/* ===== CIRCUIT WATERMARK ===== */
.circuit-watermark {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    pointer-events: none;
}

/* ===== BACKGROUND PHOTOS (scroll-reactive) ===== */
.bg-photo {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    opacity: 0;
    transition: opacity 1.5s ease;
    filter: blur(20px) saturate(0.15) sepia(0.25);
    background-size: cover;
    background-position: center;
}

.bg-photo-1 {
    background: radial-gradient(ellipse at 30% 40%, var(--ice-blue), transparent 70%);
}

.bg-photo-2 {
    background: radial-gradient(ellipse at 70% 60%, var(--oxidized-patina), transparent 70%);
}

.bg-photo-3 {
    background: radial-gradient(ellipse at 50% 80%, var(--aged-copper), transparent 70%);
}

/* ===== FROST PANEL (Hero) ===== */
#frost-panel {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    overflow: hidden;
}

.frost-hero-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background:
        linear-gradient(135deg, rgba(199, 221, 232, 0.3) 0%, transparent 50%),
        linear-gradient(225deg, rgba(163, 196, 188, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse at 60% 50%, rgba(139, 125, 107, 0.15) 0%, transparent 60%);
    filter: saturate(0.3) contrast(0.7);
    transition: filter 0.1s linear;
}

.frost-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    background: rgba(232, 239, 244, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: backdrop-filter 0.1s linear, -webkit-backdrop-filter 0.1s linear;
}

.frost-content {
    position: relative;
    z-index: 2;
    padding: clamp(3rem, 8vw, 6rem);
    padding-left: clamp(5rem, 10vw, 8rem);
}

.site-title {
    font-family: 'Bitter', 'Georgia', serif;
    font-size: clamp(3.5rem, 9vw, 7.5rem);
    font-weight: 700;
    color: var(--deep-walnut);
    letter-spacing: 0.02em;
    line-height: 1.05;
    margin-bottom: 0.5rem;
}

.site-subtitle {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    color: var(--aged-copper);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.scroll-hint {
    position: absolute;
    bottom: 3rem;
    left: clamp(5rem, 10vw, 8rem);
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.6;
    animation: hintPulse 2.5s ease-in-out infinite;
}

.scroll-hint-text {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    color: var(--aged-copper);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

@keyframes hintPulse {
    0%, 100% { opacity: 0.6; transform: translateY(0); }
    50% { opacity: 0.3; transform: translateY(4px); }
}

/* ===== MAIN RESEARCH GRID ===== */
.research-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem clamp(2rem, 5vw, 4rem);
    padding-left: clamp(5rem, 10vw, 8rem);
}

/* ===== SECTION DIVIDERS ===== */
.section-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 3rem 0 2.5rem;
}

.divider-trace {
    width: min(40vw, 350px);
    height: 20px;
    flex-shrink: 0;
}

.divider-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.8rem;
    color: var(--aged-copper);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    white-space: nowrap;
}

/* ===== GRID ROWS ===== */
.grid-row {
    display: grid;
    grid-template-columns: 1fr 0.65fr;
    gap: 2.5rem;
    margin-bottom: 2rem;
}

/* ===== PRIMARY COLUMN ===== */
.primary-column article {
    margin-bottom: 2.5rem;
}

.primary-column h2 {
    font-family: 'Bitter', 'Georgia', serif;
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--deep-walnut);
    letter-spacing: 0.02em;
    line-height: 1.05;
    margin-bottom: 1rem;
}

.primary-column p {
    max-width: 62ch;
    margin-bottom: 1.5em;
    color: var(--warm-umber);
}

/* ===== EVIDENCE COLUMN / CASE CARDS ===== */
.evidence-column {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.case-card {
    background: rgba(245, 242, 235, 0.75);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border-top: 2px solid var(--aged-copper);
    border-radius: 4px;
    padding: 1.5rem;
    box-shadow: 0 2px 12px var(--frost-shadow);
    transition: backdrop-filter 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                -webkit-backdrop-filter 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                box-shadow 0.3s ease;
}

.case-card:hover {
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    box-shadow: 0 4px 20px var(--frost-shadow);
}

.card-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.8rem;
    color: var(--aged-copper);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    display: block;
    margin-bottom: 0.5rem;
}

.case-card h3 {
    font-family: 'Bitter', 'Georgia', serif;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--deep-walnut);
    letter-spacing: 0.02em;
    line-height: 1.2;
    margin-bottom: 0.75rem;
}

.case-card p {
    font-size: 0.95rem;
    line-height: 1.65;
    color: var(--warm-umber);
}

.card-circuit {
    margin-top: 1rem;
}

.card-circuit svg {
    width: 100%;
    height: 20px;
}

/* ===== BLUR-REVEAL ANIMATION ===== */
.blur-reveal {
    filter: blur(4px);
    opacity: 0.3;
    transform: translateY(12px);
    transition: filter 700ms cubic-bezier(0.25, 0.46, 0.45, 0.94),
                opacity 700ms cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 700ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.blur-reveal.revealed {
    filter: blur(0);
    opacity: 1;
    transform: translateY(0);
}

/* ===== FOOTER ===== */
.site-footer {
    max-width: 1200px;
    margin: 4rem auto 0;
    padding: 3rem clamp(2rem, 5vw, 4rem) 4rem;
    padding-left: clamp(5rem, 10vw, 8rem);
}

.footer-trace svg {
    width: min(60vw, 600px);
    height: 20px;
    margin-bottom: 1.5rem;
}

.footer-text {
    font-family: 'Bitter', 'Georgia', serif;
    font-size: 1.1rem;
    color: var(--deep-walnut);
    margin-bottom: 0.5rem;
}

.footer-meta {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.8rem;
    color: var(--aged-copper);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

/* ===== RESPONSIVE (< 768px) ===== */
@media (max-width: 768px) {
    .circuit-spine {
        display: none;
    }

    .frost-content {
        padding-left: clamp(2rem, 5vw, 3rem);
    }

    .scroll-hint {
        left: clamp(2rem, 5vw, 3rem);
    }

    .research-grid {
        padding-left: clamp(2rem, 5vw, 3rem);
    }

    .grid-row {
        grid-template-columns: 1fr;
    }

    .site-footer {
        padding-left: clamp(2rem, 5vw, 3rem);
    }

    .divider-trace {
        width: 50vw;
    }
}